Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations


  • Omar K. Alduaij Chemistry Department College of Science Al Imam Mohammad Ibn Saud Islamic University
  • Mohamed I. Attia Chemistry Deptartment College of Science Al Imam Mohammad Ibn Saud Islamic University
  • Lotfi Khezami Chemistry Deptartment College of Science Al Imam Mohammad Ibn Saud Islamic University
  • Kamal K. Taha Chemistry Department College of Science Al Imam Mohammad Ibn Saud Islamic University



bentonite, cobalt, kinetics, equilibrium


Natural bentonite clay from Saudi Arabia was used to remove cobalt from aqueous solution. The clay samples were first characterized for their chemical composition and structure. Batch sorption studies were then conducted to assess their capacity to remove cobalt. The effect of contact time, initial analyte concentration, bentonite dose and temperature on the adsorption was investigated. The results showed that equilibrium was attained in 60 minutes. The metal adsorption was fitted to a Langmuir isotherm model and the maximum monolayer adsorption capacity was found to be 19.85 mg g1 at 333 K. The pseudo-second-order kinetic model provided the best correlation to the experimental data. The application of an intra-particle diffusion model revealed that the adsorption mechanism of the cobalt ions is a rather complex process and that diffusion is involved in the overall rate of the adsorption process, but it is not the only rate-controlling step. The activation energy, Ea, ranged between 4.33 and 9.14 kJ mol1, indicating a physical adsorption process.

Author Biographies

Omar K. Alduaij, Chemistry Department College of Science Al Imam Mohammad Ibn Saud Islamic University

Associate Professor of Inorganic Chemistry

Mohamed I. Attia, Chemistry Deptartment College of Science Al Imam Mohammad Ibn Saud Islamic University

Associate Professor of Inorganic Chemistry

Lotfi Khezami, Chemistry Deptartment College of Science Al Imam Mohammad Ibn Saud Islamic University

Assistant Professor of Physical chemistry

Kamal K. Taha, Chemistry Department College of Science Al Imam Mohammad Ibn Saud Islamic University

Associate Professor of Physical Chemistry


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Bentonite Clay




How to Cite

Alduaij, O. K., Attia, M. I., Khezami, L., & Taha, K. K. (2016). Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations. Macedonian Journal of Chemistry and Chemical Engineering, 35(1), 87–96.



Chemical Engineering